diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/platform/x86/Makefile | 1 | ||||
| -rw-r--r-- | drivers/platform/x86/intel_scu_ipc.c | 4 | ||||
| -rw-r--r-- | drivers/platform/x86/intel_scu_ipcutil.c | 133 |
4 files changed, 145 insertions, 2 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index faec777b1ed..65ba62086ca 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -576,6 +576,15 @@ config INTEL_SCU_IPC some embedded Intel x86 platforms. This is not needed for PC-type machines. +config INTEL_SCU_IPC_UTIL + tristate "Intel SCU IPC utility driver" + depends on INTEL_SCU_IPC + default y + ---help--- + The IPC Util driver provides an interface with the SCU enabling + low level access for debug work and updating the firmware. Say + N unless you will be doing this on an Intel MID platform. + config GPIO_INTEL_PMIC bool "Intel PMIC GPIO support" depends on INTEL_SCU_IPC && GPIOLIB diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 9950ccc940b..4ec4ff8f918 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o obj-$(CONFIG_TOSHIBA_BT_RFKILL) += toshiba_bluetooth.o obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o +obj-$(CONFIG_INTEL_SCU_IPC_UTIL)+= intel_scu_ipcutil.o obj-$(CONFIG_RAR_REGISTER) += intel_rar_register.o obj-$(CONFIG_INTEL_IPS) += intel_ips.o obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c index ca35b0ce944..1752ef006d2 100644 --- a/drivers/platform/x86/intel_scu_ipc.c +++ b/drivers/platform/x86/intel_scu_ipc.c @@ -497,7 +497,7 @@ int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data) "intel_scu_ipc: I2C INVALID_CMD = 0x%x\n", cmd); mutex_unlock(&ipclock); - return -1; + return -EIO; } mutex_unlock(&ipclock); return 0; @@ -642,7 +642,7 @@ update_end: if (status == IPC_FW_UPDATE_SUCCESS) return 0; - return -1; + return -EIO; } EXPORT_SYMBOL(intel_scu_ipc_fw_update); diff --git a/drivers/platform/x86/intel_scu_ipcutil.c b/drivers/platform/x86/intel_scu_ipcutil.c new file mode 100644 index 00000000000..ba3231d0819 --- /dev/null +++ b/drivers/platform/x86/intel_scu_ipcutil.c @@ -0,0 +1,133 @@ +/* + * intel_scu_ipc.c: Driver for the Intel SCU IPC mechanism + * + * (C) Copyright 2008-2010 Intel Corporation + * Author: Sreedhara DS (sreedhara.ds@intel.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; version 2 + * of the License. + * + * This driver provides ioctl interfaces to call intel scu ipc driver api + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/fcntl.h> +#include <linux/sched.h> +#include <linux/uaccess.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <asm/intel_scu_ipc.h> + +static u32 major; + +#define MAX_FW_SIZE 264192 + +/* ioctl commnds */ +#define INTE_SCU_IPC_REGISTER_READ 0 +#define INTE_SCU_IPC_REGISTER_WRITE 1 +#define INTE_SCU_IPC_REGISTER_UPDATE 2 +#define INTE_SCU_IPC_FW_UPDATE 0xA2 + +struct scu_ipc_data { + u32 count; /* No. of registers */ + u16 addr[5]; /* Register addresses */ + u8 data[5]; /* Register data */ + u8 mask; /* Valid for read-modify-write */ +}; + +/** + * scu_reg_access - implement register access ioctls + * @cmd: command we are doing (read/write/update) + * @data: kernel copy of ioctl data + * + * Allow the user to perform register accesses on the SCU via the + * kernel interface + */ + +static int scu_reg_access(u32 cmd, struct scu_ipc_data *data) +{ + int count = data->count; + + if (count == 0 || count == 3 || count > 4) + return -EINVAL; + + switch (cmd) { + case INTE_SCU_IPC_REGISTER_READ: + return intel_scu_ipc_readv(data->addr, data->data, count); + case INTE_SCU_IPC_REGISTER_WRITE: + return intel_scu_ipc_writev(data->addr, data->data, count); + case INTE_SCU_IPC_REGISTER_UPDATE: + return intel_scu_ipc_update_register(data->addr[0], + data->data[0], data->mask); + default: + return -ENOTTY; + } +} + +/** + * scu_ipc_ioctl - control ioctls for the SCU + * @fp: file handle of the SCU device + * @cmd: ioctl coce + * @arg: pointer to user passed structure + * + * Support the I/O and firmware flashing interfaces of the SCU + */ +static long scu_ipc_ioctl(struct file *fp, unsigned int cmd, + unsigned long arg) +{ + int ret; + struct scu_ipc_data data; + void __user *argp = (void __user *)arg; + + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + + if (cmd == INTE_SCU_IPC_FW_UPDATE) { + u8 *fwbuf = kmalloc(MAX_FW_SIZE, GFP_KERNEL); + if (fwbuf == NULL) + return -ENOMEM; + if (copy_from_user(fwbuf, (u8 *)arg, MAX_FW_SIZE)) { + kfree(fwbuf); + return -EFAULT; + } + ret = intel_scu_ipc_fw_update(fwbuf, MAX_FW_SIZE); + kfree(fwbuf); + return ret; + } else { + if (copy_from_user(&data, argp, sizeof(struct scu_ipc_data))) + return -EFAULT; + ret = scu_reg_access(cmd, &data); + if (ret < 0) + return ret; + if (copy_to_user(argp, &data, sizeof(struct scu_ipc_data))) + return -EFAULT; + return 0; + } +} + +static const struct file_operations scu_ipc_fops = { + .unlocked_ioctl = scu_ipc_ioctl, +}; + +static int __init ipc_module_init(void) +{ + return register_chrdev(0, "intel_mid_scu", &scu_ipc_fops); +} + +static void __exit ipc_module_exit(void) +{ + unregister_chrdev(major, "intel_mid_scu"); +} + +module_init(ipc_module_init); +module_exit(ipc_module_exit); + +MODULE_LICENSE("GPL V2"); +MODULE_DESCRIPTION("Utility driver for intel scu ipc"); +MODULE_AUTHOR("Sreedhara <sreedhara.ds@intel.com>"); |